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Windows 7: BSOD upon every Windows boot

Hi there. I'm running Win7 Professional 64 (self installed from--I think--an OEM system builder disk) on a year-old, self-built computer, and about a month ago it crashed while I was surfing the web; I haven't been able to use it since.

I get a BSOD every single time I try to run Windows. In normal mode, I get as far as my desktop and icons loading before it goes blue. In all other modes (ie, safe mode, last known good config, etc) it crashes just before the desktop appears.

I've found the BSOD is different nearly every time this happens. I've gotten everything from an IRQL_NOT_LESS_OR_EQUAL, to MEMORY_MANAGEMNT, to BAD_POOL_CALLER, to the latest, which had no title and simply pointed to a fault with the iaStorV.sys file... (Which I think I read is related to RAID control, but my Windows is not on a RAID drive--though there is one in my build.)

I'd include a dump file as specified, but I don't know how to provide that info if I can't even get into at least Safe Mode.

I've tried about every hardware ka-jiggering I can think of (unplugging, rewiring, swapping components) and nothing seems to change. I've run MemTest86 for 8 passes and found no errors. I've run chkdsk on all my drives and turned up nothing (that I can tell, anyway.) My internal temperatures seem to be okay. I'm inclined to think the problem is software based, but I have no idea what to do about it, or how to be absolutely sure.

Software-wise, System Restore only shows my latest restore point for some reason, and it fails every time I attempt it (while inside the Repair Tools menu, that is. If I try to load Windows immediately after, it tells me the restore is successful just prior to the BSOD. O.o) I've updated my BIOS as well.

I know I've tried other things that I can't remember at the moment--I've been troubleshooting this for a month now, and I'm starting to lose hope and patientce. If anyone has any suggestions for me, they would be most welcome and appreciated.

Thanks for the advice! Wish I'd come here sooner... but then, I still probably would have had to check against those other possibilities...

Anyways, I did everything you suggested. Startup Repair (from the disc) detected no problems all 4-5 times I ran it. I then restarted my computer, and it crashed immediately after the Windows logo (no BSOD, just an instant reboot). I was then immediately sent to the hard drive-based Startup Repair, which did detect a problem, which it attempted to fix with a System Restore. Which, of course, failed.

I then booted from the disc again to run Startup Repair once more. It didn't find a problem, but when I looked into the full readout I did find this:

Attached is a copy of atapi.sys from my own system. Extract that file to the USB drive, and then boot up to the command prompt as before.

Code:

copy /y f:\atapi.sys c:\windows\system32\drivers

Replace F with the letter of your USB drive (should be the same as before), and if you still get an error saying cannot find file, replace C with D.

The rootkit I am suspecting modifies the atapi.sys file; manually replacing it may or may not help.

I suspect you are using a 64-bit Windows DVD, which may be the cause of the error "The subsystem needed to support the image type is not present." You might try downloading the 32-bit repair disc and running the Kaspersky TDSSKiller tool from there. Here's the tutorial for creating such a disc: System Repair Disc - Create

Well, copying the atapi.sys file went smoothly enough, but it didn't seem to make a difference.

I have three Windows discs on me: a 64bit OEM system builder disc (which I borrowed from a friend, and is what I used to install my OS originally), and both 64bit and 32bit store-bought Win7 upgrade discs (which I used to activate my software). I tried to use the system repair tools on the 32bit upgrade disc, but it told me that that version of the tools was incompatible with my installed OS, and to switch discs.

Should I go ahead and make a System Repair disc? (That'll have to wait for my roommate to get home; the notebook I'm on doesn't have a CD drive...)

As a seperate note, my PC is no longer showing a BSOD; it simlpy restarts seconds after the Windows logo appears every time, ever since I ran the bootrec commands....

If you have a 32-bit DVD, there is no need to create a repair disc. Bear in mind that while the tools such as startup repair and system restore may be specific to their respective OS versions (32,64-bit), the command prompts work on either.

You may also try running Startup Repair a few more times now from the DVD, see what happens.

I can't get to the command prompt on the 32bit DVD, though, since it's under the System Recovery Options, and that's what refuses to load. If there's another way to get to the command prompt, I don't know it.

I ran the startup repair several more times, off the 64bit DVDs and off my hard drive. The DVD version can never detect a problem, but the PC's version does--it just can't fix the problem... (I get the same error message as that bugcheck a couple of posts back.)

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